The Air Line State Park Trail is a rail trail and linear state park located in Connecticut. The trail is divided into sections designated South (25 miles: East Hampton to Windham), North (21 miles: Windham to Putnam) a piece of the East Coast Greenway, and the Thompson addition (6.6 miles: Thompson to the Massachusetts state line). An additional 3.6 mile spur to Colchester is sometimes designated as part of the Air Line trail. At the Massachusetts state line, the trail connects to the Southern New England Trunkline Trail, a 22 mile long trail to Franklin, MA built on the same right-of-way. Since 2018, the town of Portland, CT has also maintained a 2.3 mile portion of the Airline Trail, connecting to the southern end of the state park at the town line with East Hampton. The United States Department of the Interior recognized the southern section of the Air Line State Park Trail as a national recreation trail in 2002. History Air Line Envisioned as a high speed passenger railroad line from New York to Boston, the New Haven, Middletown and Willimantic Railroad (NHM&W) got its name from the towering iron viaducts constructed to create a level track bed suitable for rapid travel. Opened in 1873 as part of the Boston, Hartford and Erie Railroad (BH&E) system, it ran from New Haven northeast via Middletown to the BH&E at Willimantic. The BH&E went bankrupt that same year, becoming the New York and New England Railroad (NY&NE), but the NHM&W stayed separate, failing in 1875. It was reorganized as the Boston and New York Air-Line Railroad and was operated by the New Haven from 1879, being leased on October 1, 1882. Part of this line (the NY&NE Blackstone division to Franklin via Norwood and Walpole) still survives as the Franklin Branch of the MBTA/MBCR. In Connecticut, part of the line from New Haven (Air Line Jct) to Middletown and Portland, Connecticut survives as part of the Providence and Worcester Railroad. In Willimantic, the Connecticut Eastern Railroad Museum has reconstructed the original roundhouse and restored the turntable pit (with a replacement for the original turntable), as well as some original NY&NE and NH buildings. In between East Hampton, Connecticut and the Massachusetts state line, most of the abandoned rail corridor has been converted as a rail trail known as the Air Line Trail State Park. Notable features of the line are the